So I have an old world on my account and when I update Minecraft new chunks spawn in that I didn't want there, and when I try to "dumb down" my Minecraft by going back an update I find the damage can't be undone. If there is any way to fix this it would be incredibly useful as it's already ruined one of my worlds.
Below is an example of the chunk glitch.
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invalid, we only support the unmodded base game.
you used mods in that world, so that world is now invalidated for this tracker
Don't set a ticket to private unless it contains exploits, security issues, or private information (username, IP)

Okay, do you want me to show you the same world without the mods? The mods don't cause this.
This has also happened on worlds where I hadn't used mods before.

doesn't matter, that world is touched by mods, and as such is no longer a vanilla world, and unsupported here

nevermind, duplicate of MC-2548